I agree with cowchucker, maybe its a good idea to still reward zombie kills in some way. Maybe with a little health, ammo or armor boost. Or maybe with kills you get an extra weaponslot, for example at the start you only have one slot, at 5 kills you get a second, maybe at 15 kills you will get your third and so forth. This way inexperienced players can still pick up a better weapon buy dropping there other weapon but they can not horde all the good weapons because they were lucky to find them first. And this way you need kills is you want for example a long, medium and close range weapon. And i read heavy weapons is making you slower, will this be like Counterstrike where the weapon selected dictates how fast you run or like Zombie Panic! were the combined weight of or your weapons count? I am more a fan of the CS system, that way its important to still keep you melee weapon as you can run fast with that one.